Define focal distance of a point?

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Focal length is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror the point where parallel rays of light meet, or converge.
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Mathematics/Physics

Focal distance is the distance from a focal point of a lens or mirror to the corresponding principal plane.
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Knowledge is Power

The distance of any point on the Hyperbola from the focus is called its focal diistance.
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